Dynamo-electric machine.



PATENTED JUNE 30, 1908.

E. MATTMAN. IDYNAMO. ELBGTR'IU MACHINE,

- No. 891,847. PATENT-ED JUNE 30, 1908.

E. MATTMAN.

DYNAMO ELECTRIC MACHINE.

PPLI TIONI LED e. A CA I AU -3L1906 2 SHEETSSHEET,2.

THE "prams FETERS co WASHINGTON. n c.

UNITED STATES PATENT OFFICE.

EMIL MATTMAN, OF NORWOOD, OHIO, ASSIGNOR TO ALLIS-OHALMERS COMPANY, A CORPO- RATION OF NEW JERSEY, AND THE BULLOCK ELECTRIC MANUFACTURING COMPANY, A

CORPORATION OF OHIO.

DYNAMO-ELECTRIC MACHINE T 0 all whom it may concern:

Be it known that I, EMIL MATTMAN, citizen of the Republic of Switzerland, residingat Norwood, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Dynamo Electric Machines, of which the following is a full, clear, and exact specification.

My invention relates to multipolar dynamo electric machines and particularly to the cross-connectors of the brush-holders.

In multipolar dynamo-electric machines, the brush-holders carrying the positive and negative brushes are usually connected together respectively by two ring-shaped strap copper cross-connectors arranged side by side. These cross-connectors are supported only by the strap conductors connected to the brush-holders.

In machines of considerable diameter it has been found that the cross-connectors are inadequately supported and braced and tend to become distorted by their own Weight, thus marring the appearance of the machine and rendering liable a short-circuit by the cross connectors coming into contact with each other. Also there is danger of the strap conductors being loosened or otherwise injured by the constant vibration.

The object of my invention is to space apart an d clamp the cross-connectorsrigidly in position so that they are held a predetermined distance apart and so that there is no danger of the cross-connectors being distorted or seriously vibrated.

In carrying out my invention I provide between the cross-connectors a plurality of spacing members and tightly clamp the spacing members and cross-connectors together.

More specifically considered my invention consists in arranging between the adjacent strap cross-connectors a plurality of insulat ing spacing members and clamp the spacing members and cross-connectors together by means of U-shaped members and tightening bolts. The clamps are thus adjustable so that the same clamps can be used on crossconnectors consisting of different numbers of layers of strap copper.

My invention still further consists in the details of construction and the combinations and arrangements of parts described in the Specification of Letters Patent.

Application filed. August 31, 1906.

Patented June 30, 1908.

Serial No. 332,777.

specification and set forth in the appended claims.

For a better understanding of my invention reference is had to the accompanying drawings in which Figure 1 is a partial .end elevation of a dynamo-electric machine equipped with my invention; Fig. 2 is a sectional elevation slightly enlarged, of the commutator end of the machine, parts being omitted for the sake of clearness Fig. 3 is an enlarged elevation of one of the cross-connector clamps showing also a portion of the cross-connector; Fig. 4 is a sectional view taken at right angles to the view shown in Fig. 3, the crossconneetors being in section and the clamps and spacing member for the cross-connectors being in elevation; and Fig. 5 is a view similar to Fig. 4 showing the cross-connectors consisting of a number of layers of strap copper.

Referring now to the figures of the drawing, 10 represents a shaft of a dynamo-electric machine on which is mounted a commutator 11 and armature 12. The field member surrounds the armature, and consists of a field frame or yoke 13 having inwardly extending field magnets 14. At the commutator end of the machine are a number of rollers 15 which support a brush yoke 16 consisting in this case of an outer ring 17, inwardly extending arms 18, and an inner ring 19. Mounted on the inner ring 19 are a plurality of brush forks 19 which carry the commutator brushes. The positive and negative brushes are connected together by the usual strap copper cross-connectors 20 arranged. side by side, all the brush-holders supporting the positive brushes being connected to one cross-connector and the brush-holders supporting the negative brushes being connected to the other cross-connector by copper straps 21. Each cross-connector consists of one or more rings of strap copper, a large number of rings or layers being provided for heavy current machines. In some machines the crossconnectors consist of strap segments of gradually increasing lengths, so that the cross-connectors gradually increase in thickness from the outer end to the end connected to the cable and carrying the heaviest current. The copper straps are bound together by cord or tape 22 as shown in Figs. 4 and 5.

In order that the cross-connectors may not I in this case, blocks of wood, and clamp the spacing members and. cross-connec tors tightly together. Each clamp consists, in this instance, of two U-shaped members 24 having perforated outwardly extending ears 25 and bolts 26 which extend through the perforated ears so as to draw the U-shaped members tightly together. The clamping members which are preferably of metal are separated l'rom the cross-connectors by the suit able thickness of insulation 27 such as fishpaper. In this ase each U-shaped clamping member is provided on opposite sides with lingers or lugs 28 which extend over the ends ol the spacing blocks and prevent displacement of the spacing members.

It is seen that the clamping members are adjustable and. can be applied to cross-conn ectors oi dillerent thicknesses. For example in, Fig. 4 each cross-connector consists of one layer or section ol copper and in Fig. 5 each cross-connector consists of four layers. The same clamps are. employed in each case except that longer bolts 26" are substituted for the shorter bolts 26 ol Fig. t. Thus it is unnecessary to carry in stock a large number of rastings or patterns. All that is necessary is to provide di'il'erent sizes of clamping bolts.

hen the cross-connectors are braced and clamped together as shown there is no danger whatever of the cross-connectors being distorted, or vibrated, or of a short-circuit occurring on account of the cross-connectors coming in contact with each other.

It is evident that many modifications can be made in the details without departing from the spirit andv scope of my invention and I aim in my claims to cover all such modifications.

What I claim as new and desire so secure by Letters Patent is 1. In a dynamo-electric machine, a pinsaid brush-holders, cross-connectors between the brushholders, spacing members between the cross-connectors, and means independent of the brush-holders and separate from said supporting means for clamping the crossconnectors and spacing members together. MIL, In a dynamo-electric machine, a plurality of brush-holders, strap cross-conl'iectors connected to the ln-ush-holders, a plurality of insulating spacing members between the strap cross-eomiectors, and clamps extending around the cross connectors 'lor fastening the cross-connectors and. spacing members together.

3. In a multipolar dynamo-electrie ma.- chine, a plurality oi" brush-holders, a pair ol strap cross-connectors for the brush-holders, spacing members between the cross-connectors, and. adjustable clamping members extending around the cross connectors lor lastening the cross-(xmnectors and spacing members together.

I. In a multipolar dynamo-electric machine, a plurality of brush-holders, a pair ol" adjacent strap crossconi'iectors for the brush-holders, a plurality of insulating spacing members between the cross-conneetors, and a plurality oi clamps around the crossconnectors, each clamp comprising a pairol" U-shaped. members and bolts for dra\\"ing the said U-shaped members tightly together.

5. In a multipolar lynamo-electric machine, a plurality of brush-lmlders, a pair ol" adjacent strap cross-connectors [or the brush-holders, a plurality of insulating spacing members between the cross-connectors, and a plurality of clamps around the crossconnectors, each clamp comprising a pair 01 U-shaped members having outwardly extending perforated or slotted ears and bolts passing through said ears, for drawing said U-shaped members together.

In testimony whereof I ailix my signature, in the presence of two witnesses.

EMIL MAT MAN.

I/Vitnesses:

A. F. Kwrs, FRED J. KINsEY.

rality of brush-holders, supporting means for 

